Flarum < 1.8.5 - Open Redirect

🗓️ 27 Sep 2026 02:09:04Reported by ProjectDiscoveryType

Flarum versions below 1.8.5 have an open redirect vulnerability allowing unauthorized redirection.

Reporter	Title	Published	Views	Family All 13
Circl	CVE-2024-21641	5 Jan 202422:26	–	circl
CNNVD	Flarum Input Validation Error Vulnerability	5 Jan 202400:00	–	cnnvd
CVE	CVE-2024-21641	5 Jan 202421:02	–	cve
Cvelist	CVE-2024-21641 Flarum's Logout Route allows open redirects	5 Jan 202421:02	–	cvelist
Github Security Blog	Flarum's logout Route allows open redirects	5 Jan 202420:53	–	github
NVD	CVE-2024-21641	5 Jan 202421:15	–	nvd
OSV	GHSA-733R-8XCP-W9MR Flarum's logout Route allows open redirects	5 Jan 202420:53	–	osv
Prion	Design/Logic Flaw	5 Jan 202421:15	–	prion
Positive Technologies	PT-2024-18991 · Flarum · Flarum	5 Jan 202400:00	–	ptsecurity
Rapid7 Vulnerability Database (full)	CVE-2024-21641: URL Redirection to Untrusted Site	5 Jan 202400:00	–	rapid7

Source	Link
github	www.github.com/flarum/framework/security/advisories/GHSA-733r-8xcp-w9mr
github	www.github.com/flarum/flarum-core/commit/ee8b3b4ad1413a2b0971fdd9e40f812d2a3a9d3a
nvd	www.nvd.nist.gov/vuln/detail/CVE-2024-21641

id: CVE-2024-21641

info:
  name: Flarum < 1.8.5 - Open Redirect
  author: kking
  severity: medium
  description: |
    Flarum is open source discussion platform software. Prior to version 1.8.5, the Flarum `/logout` route includes a redirect parameter that allows any third party to redirect users from a (trusted) domain of the Flarum installation to redirect to any link. For logged-in users, the logout must be confirmed. Guests are immediately redirected. This could be used by spammers to redirect to a web address using a trusted domain of a running Flarum installation.
  impact: |
    Unauthenticated attackers can redirect users to malicious phishing sites using the trusted domain of the Flarum installation.
  remediation: |
    Update Flarum to version 1.8.5 or later.
  reference:
    - https://github.com/flarum/framework/security/advisories/GHSA-733r-8xcp-w9mr
    - https://github.com/flarum/flarum-core/commit/ee8b3b4ad1413a2b0971fdd9e40f812d2a3a9d3a
    - https://nvd.nist.gov/vuln/detail/CVE-2024-21641
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N
    cvss-score: 4.7
    cve-id: CVE-2024-21641
    cwe-id: CWE-601
    epss-score: 0.01067
    epss-percentile: 0.63385
    cpe: cpe:2.3:a:flarum:flarum:*:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 1
    vendor: flarum
    product: flarum
    fofa-query: header="flarum_session="
    zoomeye-query: app="Flarum"
  tags: cve,cve2024,flarum,redirect,vuln

http:
  - method: GET
    path:
      - "{{BaseURL}}/logout?return=http://oast.pro"

    matchers-condition: and
    matchers:
      - type: regex
        part: header
        regex:
          - '(?m)^(?:Location\s*?:\s*?)(?:https?:\/\/|\/\/|\/\\\\|\/\\)(?:[a-zA-Z0-9\-_\.@]*)oast\.pro\/?(\/|[^.].*)?$'
          - "Set-Cookie: flarum_session="
        condition: and

      - type: status
        status:
          - 302
# digest: 4a0a00473045022100959128389aa52efc90a9bf672bf33df3930ef106510cf8f63a0ec824f37e9c4b0220625bdf738d4422fe29b53266decee418d38af34b57815346eb3b054b4fd2efa5:922c64590222798bb761d5b6d8e72950

04 Feb 2026 07:00Current

6Medium risk

Vulners AI Score6

CVSS 3.14.7 - 6.5

EPSS0.01067

SSVC